Question

resolva as equações a)x+15=11 b)19x=266 c)x/13=-2 d)1,5x-6=0 e)1,5x+4=19 f)x/5 -3=10

Answer 1

Resolva as equações Resolva as equações a)x+15=11 b)19x=266 c)x/13=-2 d)1,5x-6=0 e)1,5x+4=19 f)x/5 -3=10


a)x+15=11

x = 11 - 15
x = - 4



 b)19x=266
x = 266/19
x = 14


c)x/13=-2

x
---  = - 2
13

x = 13(2)
--------------
     13

x = 13(-2)
x = - 26


d)1,5x-6=0
1,5x = + 6
x = 6/1,5
x = 4


e)1,5x+4=19
1,5 = 19 - 4
1,5x = 15
x = 15/1,5
x = 10


 f)x/5 -3=10
x
---  - 3 = 10
5


x - 5(3) = 5(10)
---------------------     fraç~çao com igualdade desprezamos o denominador
          5 

x  - 5(3) = 5(10)
x - 15 = 50
x = 50 + 15
x = 65

Answer 2

$a) \\ \\ x + 15 = 11 \\ \\ x = 11 - 15 \\ \\ x = - 4$

================

$b) \\ \\ 19x = 266 \\ \\ x = \dfrac{266}{19} \\ \\ x = 14$

================

$c) \\ \\ \dfrac{x}{13} = - 2 \\ \\ \\ \dfrac{x}{13} + 2 = 0 \\ \\ \\ \dfrac{x + 26 }{13} = 0 \\ \\ \\ x + 26 = 0 \\ \\ \\ x = -26$

================

$d) \\ \\ 1,5x - 6 = 0 \\ \\ 1,5x = 6 \\ \\ \\ x = \dfrac{6}{1,5} \\ \\ \\ x = 4$

===============

$e) \\ \\ 1,5x + 4 = 19 \\ \\ 1,5x = 19 - 4 \\ \\ 1,5x = 15 \\ \\ \\ x = \dfrac{15}{1,5} \\ \\ \\ x = 10$

==============

$f) \\ \\ \dfrac{x}{5} - 3 = 10 \\ \\ \\ \dfrac{x - 15}{5} -10 = 0 \\ \\ \\ \dfrac{x - 15 - 50}{5} = 0 \\ \\ \\ \dfrac{x - 65}{5} = 0 \\ \\ \\ x - 65 = 0 \\ \\ \\ x = 65$